Shell functions to close/open ports

################
################
### usage: openport [-p] port
### usage: closeport [-p PROTOCOL] port
### options:
### -p, --protocol : protocol (default=tcp)
################
#
#
function openport () {

    protocol=tcp
    OPTS=`getopt -o p: -l protocol: -- "$@"`

    if [ $? -ne 0 ];
        then
                return 1
        fi

    eval set -- "$OPTS"

    while true ; do
        case "$1" in
            -p|--protocol) protocol=$2; shift 2;;
            --) shift; break;;
            *) break;;
        esac
    done

    port=$1
    sudo iptables -A INPUT -p $protocol --dport $port -j ACCEPT; }

    function closeport () {
    protocol=tcp
    OPTS=`getopt -o p: -l protocol: -- "$@"`

    if [ $? -ne 0 ];
        then
                return 1
        fi

    eval set -- "$OPTS"

    while true ; do
        case "$1" in
            -p|--protocol) protocol=$2; shift 2;;
            --) shift; break;;
            *) break;;
        esac
    done

    port=$1
    sudo iptables -A INPUT -p $protocol --dport $port -j REJECT; }
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